Angle Positioning Device of Rotation Shaft and Foldable Electronic Device Having The Same

ABSTRACT

An angle positioning device of a rotation shaft comprises a first pivot portion and a second pivot portion. The first pivot portion comprises a first face comprising a positioning portion, a first path and a second path being divided by the positioning portion; and a second face comprising a returning portion, a third path and a fourth path being divided by the returning portion. The second pivot portion can move along the first path, the second path, the third path, and the fourth path. When the second pivot portion moves from the first path to the second path, the pivot angle is increased. When the second pivot portion moves from the third path to the fourth path, the pivot angle is decreased, whereby when the pivot portion moves from the first path to the positioning portion, the pivot angle cannot be decreased. The second pivot portion can move from the third path through the returning portion and back to the first path.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a positioning device and an electronic device thereof, and more particularly, to an angle positioning device of a rotation shaft and an electronic device thereof.

2. Description of the Related Art

Foldable electronic devices are commonly used in electronic equipment. In a dual display screen laptop, for example, the angle between the cover piece and the body piece of the dual display screens is approximately 250 to 270 degrees (forming an inverted V-shape), which allows two users to view the screen from opposite sides. This facilitates the process of a presentation or participation in a computer game by two players.

However, if there is no angle positioning device on the rotation shaft to maintain the angle between the cover piece and the body piece at 250 to 270 degrees, the weight of the cover piece and the body piece can easily cause the parts to slide downwards, thus causing the angle to deviate and the inverted V-shape to no longer be maintained.

Therefore, it is necessary to provide a rotation shaft angle positioning device for a foldable electronic device in order to resolve the aforementioned problem.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a rotation shaft angle positioning device for a foldable electronic device.

Another object of the present invention is to provide an electronic device comprising a rotation shaft angle positioning device.

To achieve the above mentioned objects, the present invention provides a foldable electronic device consisting of a cover piece, a body piece, and a rotation shaft angle positioning device, whereby a pivot angle is formed between the cover piece and the body piece. The rotation shaft angle positioning device comprises a first pivot portion and a second pivot portion. The first pivot portion comprises a first face, wherein the first face comprises a positioning portion, a first path and a second path being divided by the positioning portion; and a second face comprising a returning portion, a third path and a fourth path being divided by the returning portion. The second pivot portion can move along the first path, the second path, the third path, and the fourth path. When the second pivot portion moves from the first path to the second path, the pivot angle is increased. When the second pivot portion moves from the third path to the fourth path, the pivot angle is decreased. When the pivot portion moves from the first path to the positioning portion, the pivot angle cannot be decreased. The second pivot portion can move from the third path through the returning portion to return to the first path.

According to one embodiment of the present invention, the second pivot portion comprises: a pivot mechanism which is pivotally connected to the first pivot portion; a driving unit which is pivotally connected to the pivot mechanism, the driving unit comprising a hook portion; the hook portion can move along the first path, the second path, the third path, and the fourth path; a converging portion which is used to move the hook portion from the second path to the third path; and a spring unit which is connected to the driving unit. The spring unit provides the driving unit with the force needed to press the hook portion on the first path, the second path, the third path, and the fourth path, and also the force needed to move the hook portion from the fourth path to the first path.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a foldable electronic device of the present invention.

FIG. 2 shows the hook portion of a rotation shaft angle positioning device located in the first path

FIG. 3 shows the hook portion of a rotation shaft angle positioning device located at the positioning portion.

FIG. 4 shows the hook portion of the rotation shaft angle positioning device located at the converging portion.

FIG. 5 shows the trail of the hook portion of the rotation shaft angle positioning device moving from the second path to the third path.

FIG. 6 shows the hook portion of the rotation shaft angle positioning device located in the third path.

FIG. 7 shows the trail of the hook portion of the rotation shaft angle positioning device moving along the third path and the fourth path, and then into the first path.

FIG. 8 shows the hook portion of the rotation shaft angle positioning device located on the returning portion.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The advantages and innovative features of the invention will become more apparent from the following preferred embodiments.

Refer to FIG. 1 for a foldable electronic device of the present invention. An electronic device 90 consists of a cover piece 92, a body piece 94, and a rotation shaft angle positioning device 1, wherein the cover piece 92 and body piece 94 are connected by a pivot, whereby a pivot angle θ is formed between the cover piece 92 and the body piece 94. In the embodiment shown in FIG. 1, the pivot angle θ of the foldable electronic device 90 is locked at 250 degrees.

For example, when the foldable electronic device 90 is a dual screen laptop with θ=250 degrees, two people can view the screen from opposite sides at this position. It can be used for a presentation or for a computer game with two players, such as a card game. Please note that the foldable electronic device of the present invention is not limited to the abovementioned configuration.

Next refer to FIG. 2, which shows the hook portion located at the first path of the rotation shaft angle positioning device. The rotation shaft angle positioning device 1 comprises a first pivot portion 10 and a second pivot portion 40. In the present embodiment, the first pivot portion 10 is connected to the body piece 94 of the foldable electronic device 90, and the second pivot portion 40 is connected to the cover piece 92 of the foldable electronic device 90; thus, a fixed side is formed by the first pivot portion 10 and the body piece 94, and a rotational side is formed by the second pivot portion 40 and the cover piece 92.

Please note that the connecting position of the first pivot portion 10 and the second pivot portion 40 is not limited to the aforementioned position. For example, the first pivot portion 10 can be connected to the cover piece 92, and the second pivot portion 40 can be connected to the body piece 94.

The first pivot portion 10 comprises a first face and a second face. In the present embodiment, the first face has a curved surface, comprising a positioning portion 22, a converging portion 24, a first path 26, and a second path 28, wherein the first path 26 and the second path 28 of the first face are divided by the positioning portion 22, and the positioning portion 22 and the converging portion 24 are located at opposite ends of the second path 28, wherein the positioning portion 22 is used to lock the hook portion 442, and the converging portion 24 is used to move the hook portion 442 from the second path 28 to the third path 32. Although the positioning portion 22 has a protruding shape as shown in the present embodiment, the positioning portion 22 is by no means limited to this shape.

In the present embodiment, the second face has a curved surface and is adjacent to the first face. The second face comprises a returning portion 31, a third path 32, and a fourth path 34, wherein the third path 32 and the fourth path 34 of the second face are divided by the returning portion 31, wherein the third path 32 is relatively lower than the second path 28 such that the third path 32 forms a groove, and the fourth path 34 is not relatively lower than the first path 26. In the present invention, the first path 26 and the fourth path 34 are on the same surface. Please note that the first path 26 can also be relatively lower than the fourth path 34.

The second pivot portion 40 comprises a pivot mechanism 42, a driving unit 44, and a spring unit, wherein the pivot mechanism 42 is pivotally connected to the first pivot portion 10. In the present embodiment, the pivot mechanism 42 is connected to the cover piece 92; therefore, when the user rotates the cover piece 92, it will also cause the pivot mechanism 42 to move. One end of the driving unit 44 is pivotally connected to the pivot mechanism 42, and the other end of the driving unit 44 comprises the hook portion 442.

The hook portion 442 can move along the first path 26, the second path 28, the third path 32, and the fourth path 34. The pivot angle θ gradually increases as the hook portion 442 moves from the first path 26 to the second path 28; the pivot angle θ gradually decreases as the hook portion 442 moves from the third path 32 to the fourth path 34.

The spring unit is connected to the driving unit 44. The spring unit allows the hook portion 442 of the driving unit 44 to exert force in a specific direction. In the present embodiment, the spring unit comprises a first spring piece 52 and a second spring piece 54. The first spring piece 52 provides the force needed to press the hook portion 442 of the driving unit 44 against the first path 26, the second path 28, the third path 32, and the fourth path 34; the second spring piece 54 provides the force required to move the hook portion 442 of the driving unit 44 from the fourth path 34 to the first path 26.

In the present embodiment, the first spring piece 52 is a torsion spring, and the second spring piece 54 is a compression spring, wherein the direction of the force applied by the first spring piece 52 and second spring piece 54 is substantially perpendicular.

When the hook portion 442 moves from the first path to the positioning portion 22, a “locked position” is attained. At this position, the pivot angle θ cannot be decreased, so the cover piece 92 is locked into a position which cannot be rotated; thus, the objective of providing a rotation shaft angle positioning device is achieved. In the present embodiment, when the rotation shaft angle positioning device 1 is at the locked position, the pivot angle θ lies between 250 to 270 degrees. However, the pivot angle θ can be designed according to user requirements.

When the hook portion 442 moves from the third path 32 to the returning portion 31, a “returning position” is attained. At the “returning position” in the present embodiment, the pivot angle θ lies between 180 to 240 degrees. However, the pivot angle θ is not limited to this range. The hook portion 442 can move along the third path 32. As the hook portion 442 moves past the returning portion 31, the hook portion 442 will land on the fourth path 34. Next, the second spring piece 54 aids the hook portion 442 to move from the fourth path 34 back to the first path 26.

The subsequent section will describe the actual movement of the rotation shaft angle positioning device 1 in different stages. In the following embodiment, the pivot angle θ of the locked position is set at 250 degrees, and the pivot angle θ of the returning position is set at 200 degrees.

(1) Hook Portion 442 Located at First Path 26

Refer to FIG. 2. When the user opens the foldable electronic device 90 from a pivot angle θ of 0 degrees (completely closed) to less than 250 degrees, the pivot mechanism 42 and the driving unit 44 will rotate simultaneously, and the hook portion 442 of the driving unit 44 will slide along the first path 26 of the first face.

At this stage, the hook portion 442 has not yet moved into the positioning portion 22; therefore, the cover piece 92 and the body piece 94 of the foldable electronic device 90 are not in a locked position.

(2) Hook Portion 442 Located at Positioning Portion 22

Refer to FIG. 3, which shows the hook portion of a rotation angle positioning device locating at the positioning portion. Assuming the user continues to open the cover piece 92 of the foldable electronic device 90 as mentioned in stage (1), and the pivot angle θ will reach 250 degrees. At this instant, the hook portion 442 arrives at a protruding shape of the positioning portion 22, and the shape of the positioning portion 22 causes the hook portion 442 to lift slightly and move into the intersection between the positioning portion 22 and the second path 28 (as shown in FIG. 3). A locked position is attained when the rotation shaft angle positioning device 1 is in this configuration.

Under this situation, the positioning portion restricts the movement of the hook portion 442; as a result, the user cannot rotate the cover piece 92 in the reverse direction. Therefore, the foldable electronic device 90 can be stably mounted onto a flat surface (as shown in FIG. 1).

(3) Hook Portion 442 Located at Converging Portion 24

Refer to FIG. 4 and FIG. 5 simultaneously. FIG. 4 shows the hook portion of the rotation shaft angle positioning device located at the converging portion. FIG. 5 shows the trail of the hook portion of the rotation shaft angle positioning device moving from the second path to the third path. In order to present the trail of the hook portion more clearly, the trail is represented by a dashed arrow, and the hook portion is excluded from FIG. 5.

If the user wants to unlock the position of the rotation shaft angle positioning device 1, the cover piece must be continuously opened to increase the pivot angle θ. Under this circumstance, the hook portion 442 moves along the second path 28 in the direction of the arrow shown in FIG. 5. When the hook portion 442 moves to the slanted surface of the converging portion 24, the hook portion 442 will be guided by the converging portion 24, causing the hook portion 442 to move from the second path 28 along converging portion 24 towards the third path 32. In the present embodiment, the hook portion 442 moves along the converging portion 24 when the pivot angle θ is between 250 and 270 degrees.

(4) Hook Portion 442 Located on the Third Path 32

Refer to FIG. 6 and FIG. 7 simultaneously. FIG. 6 shows the hook portion of the rotation shaft angle positioning device located on the third path. FIG. 7 shows the trail of the hook portion of the rotation shaft angle positioning device moving from the third path and the fourth path and into the first path. In order to present the trail of the hook portion more clearly, the trail is represented by a dashed arrow, and the hook portion 442 is excluded from FIG. 7.

As the pivot angle θ, as mentioned in stage (3), increases continuously, the hook portion 442 will be guided by the converging portion 24 and reach the third path 32. The first spring piece 52 will cause the hook portion 442 to move into the groove of the third path 32 (as shown in FIG. 6). In the present embodiment, the hook portion 442 enters into the third path 32 when the pivot angle θ is 270 degrees.

At this instant, the hook portion 442 will be restricted by the side wall of the groove; thus, the hook portion 442 will be able to move only along the third path 32. At this stage, the hook portion 442 moves along the third path 32 and will not come into contact with the positioning portion 22.

Next, the user can move the cover piece 92 of the foldable electronic device 90 backward such that the pivot angle θ gradually decreases, and the hook portion 442 will slide along the third path 32 (in the direction of the arrow shown in FIG. 7).

(5) Hook Portion 442 Located at Returning Portion 31

Refer to FIG. 7 and FIG. 8 simultaneously. FIG. 8 shows the hook portion of the rotation shaft angle positioning device located at the returning portion 31. As the pivot angle θ gradually decreases, as described in stage (4), the hook portion 442 moves along the third path 32 and reaches the returning portion 31. At this stage, there is no side wall on the groove to restrict the movement of the hook portion 442, and the force of the second spring piece 54 will move the hook portion 442 from the third path 32 into the fourth path 34. The fourth path 34 is the path linking the third path 32 and the first path 26.

Next, the force of the second spring piece 54 will move the hook portion 442 from the fourth path 34 back to the first path 26. At this instant, the rotation shaft angle positioning device 1 returns to an unlocked state, as described in stage (1). In the present embodiment, as the pivot angle θ decreases to 200 degrees, the hook portion 442 will move along the third path 32, then the fourth path 34, and then back to the first path 26.

Next, the user can decrease the pivot angle θ continuously, such that the hook portion 442 moves along the first path 26 (as shown in FIG. 7) until the pivot angle θ becomes 0 degrees. At this instant, the foldable electronic device 90 is in a completely closed state.

The abovementioned steps from stage (1) to stage (5) are repetitive. The next time the user wishes to use the foldable electronic device 90 to lock the position of the cover piece 92 and the body piece 94, steps (1) and (2) of the process will be performed, and if the user wishes to unlock the position, the process then proceeds to step (3) through step (5).

Although the present invention has been explained in relation to its preferred embodiment, it is also of vital importance to acknowledge that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed. 

1. A rotation shaft angle positioning device for a foldable electronic device, the foldable electronic device comprising a cover piece and a body piece pivotally connected to each other, a pivot angle being formed between the cover piece and the body piece; the rotation shaft angle positioning device comprises: a first pivot portion comprising: a first face comprising a positioning portion, the positioning portion dividing the first face into a first path and a second path; and a second face comprising a returning portion, the returning portion dividing the second face into a third path and a fourth path; and a second pivot portion; the second pivot portion can move along the first path, the second path, the third path, and the fourth path; as the second pivot portion moves from the first path to the second path, the pivot angle is increased; as the second pivot portion moves from the third path to the fourth path, the pivot angle is decreased; whereby as the second pivot portion moves from the first path to the positioning portion, a locked position is attained and the pivot angle cannot be decreased; the second pivot portion can move from the third path to the returning portion and then back to the first path.
 2. The rotation shaft angle positioning device as claimed in claim 1, wherein the first face is a curved surface, the first face further comprising a converging portion, wherein the positioning portion and the converging portion are located at the two ends of the second path; the second face is a curved surface and is adjacent to the first face, wherein the third path is relatively lower than the second path, and the fourth path is not relatively lower than the first path; wherein the second pivot portion further comprises: a pivot mechanism which is pivotally connected to the first pivot portion; a driving unit which is pivotally connected to the pivot mechanism, the driving unit comprising a hook portion; the hook portion can move along the first path, the second path, the third path, and the fourth path; and the converging portion is used to move the hook portion from the second path to the third path, wherein the pivot angle gradually increases as the hook portion moves from the first path to the second path; wherein the pivot angle gradually decreases as the hook portion moves from the third path to the fourth path; and a spring unit which is connected to the driving unit; the spring unit provides the hook portion of the driving unit with the force needed to press the first path, the second path, the third path, and the fourth path, and also provides the force needed to move the hook portion from the fourth path to the first path; whereby as the hook portion moves from the first path to the intersection between the second path and the positioning portion, the locked position is attained and the pivot angle cannot be decreased; the hook portion can move from the third path to the returning portion and then back to the first path.
 3. The rotation shaft angle positioning device as claimed in claim 2, wherein the positioning portion is a protruding shape.
 4. The rotation shaft angle positioning device as claimed in claim 1, wherein the pivot angle lies between 250 and 270 degrees when the locked position is attained.
 5. The rotation shaft angle positioning device as claimed in claim 4, wherein the spring unit comprises a first spring piece and a second spring piece; the first spring piece provides the hook portion of the driving unit with the force needed to press the first path, the second path, the third path, and the fourth path; the second spring piece provides the force needed to move the hook portion from the fourth path to the first path.
 6. The rotation shaft angle positioning device as claimed in claim 5, wherein the first spring piece is a torsion spring and the second spring piece is a compression spring.
 7. The rotation shaft angle positioning device as claimed in claim 6, wherein the directions of the forces applied by the first spring piece and the second spring piece are substantially perpendicular.
 8. The rotation shaft angle positioning device as claimed in claim 3, wherein the pivot angle lies between 250 and 270 degrees when the locked position is attained.
 9. The rotation shaft angle positioning device as claimed in claim 8, wherein the spring unit comprises a first spring piece and a second spring piece; the first spring piece provides the hook portion of the driving unit with the force needed to press the first path, the second path, the third path, and the fourth path; the second spring piece provides the force needed to move the hook portion from the fourth path to the first path.
 10. The rotation shaft angle positioning device as claimed in claim 9, wherein the first spring piece is a torsion spring and the second spring piece is a compression spring.
 11. The rotation shaft angle positioning device as claimed in claim 10, wherein directions of forces applied by the first spring piece and the second spring piece are substantially perpendicular.
 12. The rotation shaft angle positioning device as claimed in claim 1, wherein the first pivot portion is connected to the body piece, and the second pivot portion is connected to the cover piece.
 13. The rotation shaft angle positioning device as claimed in claim 1, wherein the first pivot portion is connected to the cover piece, and the second pivot portion is connected to the body piece.
 14. The rotation shaft angle positioning device as claimed in claim 2, wherein the first pivot portion is connected to the body piece, and the second pivot portion is connected to the cover piece.
 15. The rotation shaft angle positioning device as claimed in claim 2, wherein the first pivot portion is connected to the cover piece, and the second pivot portion is connected to the body piece.
 16. A foldable electronic device with a rotation shaft angle positioning device, comprising a rotation shaft angle positioning device as claimed in claim
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